公开(公告)号：US12044714B2

公开(公告)日：2024-07-23

申请号：US17270899

申请日：2018-08-30

Applicant: NEC Corporation

Inventor： Murtuza Petladwala ,  Mitsuru Sendoda ,  Yuko Ohta ,  Ryota Suzuki

IPC: G01R23/10 ,  G01R23/14 ,  G01R23/18

CPC classification number: G01R23/10 ,  G01R23/145 ,  G01R23/18

Abstract: Provided a method comprising: obtaining waveform data sets of a periodic electric waveform signal, with a length set to one cycle time; calculating a frequency spectrum for each waveform data set; extracting and separating odd and even frequency harmonics to create odd and even frequency harmonic matrices on which a canonical correlation analysis (CCA) being applied to obtain CCA features; performing linear transformation on the CCA features to obtain linear transformed features; generating a model based on the linear transformed features; performing magnitude quantization of frequency spectrums of waveform data sets to identify normal and anomalous waveform signals.

公开(公告)号：US20240199095A1

公开(公告)日：2024-06-20

申请号：US18288070

申请日：2021-05-07

Applicant: NEC Corporation

Inventor： Yuko Ohta ,  Reishi Kondo ,  Sakiko Mishima ,  Yumi Arai

IPC: B61K9/08 ,  B61L23/04 ,  G01N29/44

CPC classification number: B61K9/08 ,  B61L23/042 ,  G01N29/4445

Abstract: A data collection device according to an aspect of the present disclosure includes: at least one memory storing a set of instructions; and at least one processor configured to execute the set of instructions to: detect a target data point that is a data point at which a target is observed in acoustic data obtained by observation of the target; determine an analysis range in the acoustic data based on the target data point; detect an abnormality in the analysis range; and output information of the analysis range in which the abnormality is detected.

公开(公告)号：US12216024B2

公开(公告)日：2025-02-04

申请号：US17802410

申请日：2020-03-18

Applicant: NEC Corporation

Inventor： Yuko Ohta ,  Reishi Kondo

IPC: G01M17/00 ,  G01M17/08

Abstract: This signal analysis device provides information to assist determining the state of a time series signal. An identification unit (120) identifies events included in the time series signal, and a ranking generation unit (140) generates a ranking among multiple event types.

公开(公告)号：US11263859B2

公开(公告)日：2022-03-01

申请号：US16634662

申请日：2017-08-02

Applicant: NEC Corporation

Inventor： Yuko Ohta ,  Shingo Takahashi ,  Eisuke Saneyoshi ,  Junichi Miyamoto ,  Shigeru Koumoto

IPC: G07F9/02 ,  G06Q10/00 ,  G07F13/00

Abstract: A maintenance monitoring apparatus includes: a maintenance management part that manages, based on a monitoring result of a current or power of a vending machine that provides a beverage by extracting the beverage from a raw material, whether an operation performed on the vending machine is a predetermined maintenance operation and whether the maintenance has been executed at an appropriate time interval and as many times as necessary; and a notification part that notifies that a maintenance has been executed or not.